'03 Prerunner Just Bought - Baseline Maintenance

Hi All, Just purchased a used 2003 Prerunner private party. V6, 27K, Florida truck, saw it on CL, took a shot, flew down, drove it 1300 miles north to Massachusetts no problems. Thing is nice. Undercarriage flawless and that was what I was looking for having already had a 1st gen bought back by Toyota on the frame rust recall. Anyway, looking to perform baseline maintenance on it, something along the lines of recommended 30K in the book. Wanted to here your thoughts...

2) Once home, noticed passenger side front wheel squeal, happened for couple days, then driver side started as well. This the clip that tells you pads are low? Or something else?

3) Plan to baby this thing, love the 1st gens and becoming harder to come by in great shape up north. This will be garage kept and seldom driven in winter/salt. Do you guys keep humidity level in garage at certain level to reduce rust?

I'd check the pad indicators on the brakes first. Mine were squealing and it stopped whenever I hit the brakes. I figured no way was it the pad indicators but sure enough it was. Changed the pads and no more squeaks.